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r r ® r rr r ® r rr ® ® r rr ® r r ® rr rr <br /> Table A-1 <br /> SAMPLE VOLUME, CONTAINER, PRESERVATIVE AND <br /> HOLDING TIME FOR INDICATOR PARAMETERS <br /> (Continued) <br /> Volume Holding <br /> Parameter Required (ml) Container Preservative Time <br /> Volatile organics 40/Duplicated Glass with Refrigerate 14 Days <br /> (EPA Method 624) Teflon septum to 4°C, HC1 <br /> to pH<2 <br /> Metals, except 1,000 Plastic, Glass HNO3 to pH<2 6 Months <br /> mercury2 <br /> Mercury2 500 Plastic, Glass HNO3 to pH<2 28 Days <br /> Sulfate 500 Plastic, Glass Refrigerate to 28 Days <br /> °C <br /> Chemical oxygen demand 100 Plastic, Glass Refrigerate to 28 Days <br /> 4°C, H2SO4 to <br /> pH<2 <br /> MBAS (surfactants) 100 Plactic,Glass Refrigerate to 48 Hours <br /> 4°C <br /> Fluoride 500 Plastic None required 28 Days <br /> 1. Plastic = Linear Polyethylene <br /> 2. Field filtered through a disposable, 0.45-micron, acryllic copolymer filter prior to preser- <br /> vation with nitric acid. <br /> PJ9 9390207.00D A-7 <br />